The folks over at Improv Everywhere turned in another really great mission.  Basically they got sets of twins to sit across from each other on the subway and mirror each other’s actions, creating a human mirror.  Some of the long shots down the car where you can see all of the people were really cool, it really looks like there is a long mirror in the middle of the car.

You can also see another clip here from ABC covering the mission.  Second link courtesy of Anna (where should I link for you?)